Toyota 4Runner manuals

Toyota 4Runner: Lost Communication with Gateway Module (Power Management2) (U1002)

Toyota 4Runner Service Manual / Power Source / Network / Networking / Can Communication System / Lost Communication with Gateway Module (Power Management2) (U1002)

DESCRIPTION

  • The power management control ECU stores this DTC when no signals can be received from the ECUs that are memorized as those connected to the power management bus.
  • When the power management control ECU receives a response signal from the ECUs connected to the power management bus, the power management ECU recognizes and memorizes that the ECU is connected to the power management bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the power management bus when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that are memorized as those connected to the power management bus, the power management control ECU determines that a malfunction exists.
  • If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).

DTC Code

DTC Detection Condition

Trouble Area

U1002

Lost communication with the gateway module (Power Management2).

  • Power management bus circuit
  • Air conditioning amplifier assembly branch wire or connector
  • Power management control ECU main wire or connector
  • ECM main wire or connector
  • Air conditioning amplifier assembly
  • Power management control ECU
  • ECM
  • No. 3 junction connector

HINT:

For vehicles with a smart key system only.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1.

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and branch wire.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ).



NEXT

2.

CHECK FOR CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

Resistance: Malfunction

F80-12 (CA3P) - F80-11 (CA3N)

Ignition switch off

54 to 69 Ω

Below 54 Ω: Short in line

Ignition switch off

Higher than 69 Ω: Open in CAN main bus line

F80-12 (CA3P) - F80-1 (AM22)

Ignition switch off

6 kΩ or higher

Below 6 kΩ: +B short

F80-11 (CA3N) - F80-1 (AM22)

Ignition switch off

6 kΩ or higher

Below 6 kΩ: +B short

F80-12 (CA3P) - F80-6 (GND)

Ignition switch off

200 Ω or higher

Below 200 Ω: Ground short

F80-11 (CA3N) - F80-6 (GND)

Ignition switch off

200 Ω or higher

Below 200 Ω: Ground short

Text in Illustration

*a

Component with harness connected

(Power Management Control ECU)

Result

Result

Proceed to

NG

- Open in CAN main bus line

A

NG

- Short in line

- +B short

- Ground short

B

OK

C



B

GO TO STEP 9


C

GO TO STEP 18


A

3.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)

(a) Disconnect the F83 No. 3 junction connector connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F83-1 (CANH) - F83-12 (CANL)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)


NG

GO TO STEP 5


OK

4.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F83-2 (CANH) - F83-13 (CANL)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)



OK

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR


NG

GO TO STEP 7

5.

CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.


NEXT

6.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the F50 ECM connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F50-34 (CANP) - F50-33 (CANN)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to ECM)


OK

REPLACE ECM


NG

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 3 JUNCTION CONNECTOR)

7.

CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.


NEXT

8.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the F80 power management control ECU connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F80-12 (CA3P) - F80-11 (CA3N)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT CONTROL ECU - NO. 3 JUNCTION CONNECTOR)

9.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the F83 No. 3 junction connector connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F83-3 (CANH) - F83-14 (CANL)

Ignition switch off

200 Ω or higher

F83-3 (CANH) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F83-14 (CANL) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F83-3 (CANH) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F83-14 (CANL) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

*b

Front view of DLC3


NG

GO TO STEP 12


OK

10.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - ECM)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F83-1 (CANH) - F83-12 (CANL)

Ignition switch off

108 to 132 Ω

F83-1 (CANH) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F83-12 (CANL) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F83-1 (CANH) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F83-12 (CANL) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

*b

Front view of DLC3



NG

GO TO STEP 14


OK

11.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F83-2 (CANH) - F83-13 (CANL)

Ignition switch off

108 to 132 Ω

F83-2 (CANH) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F83-13 (CANL) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F83-2 (CANH) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F83-13 (CANL) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

*b

Front view of DLC3



OK

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR


NG

GO TO STEP 16

12.

CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.


NEXT

13.

CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the F42 air conditioning amplifier assembly connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F42-11 (CANH) - F42-12 (CANL)

Ignition switch off

54 to 69 Ω

F42-11 (CANH) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F42-12 (CANL) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F42-11 (CANH) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F42-12 (CANL) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

*b

Front view of DLC3


OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


NG

REPAIR OR REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE OR CONNECTOR (CANH, CANL)

14.

CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.


NEXT

15.

CHECK FOR SHORT IN CAN BUS WIRES (ECM)

(a) Disconnect the F50 ECM connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F50-34 (CANP) - F50-33 (CANN)

Ignition switch off

108 to 132 Ω

F50-34 (CANP) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F50-33 (CANN) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F50-34 (CANP) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F50-33 (CANN) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to ECM)

*b

Front view of DLC3


OK

REPLACE ECM


NG

REPAIR OR REPLACE ECM MAIN WIRE OR CONNECTOR (CANP, CANN)

16.

CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.


NEXT

17.

CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the F80 power management control ECU connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F80-12 (CA3P) - F80-11 (CA3N)

Ignition switch off

108 to 132 Ω

F80-12 (CA3P) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F80-11 (CA3N) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F80-12 (CA3P) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F80-11 (CA3N) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)

*b

Front view of DLC3


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU MAIN WIRE OR CONNECTOR (CA3P, CA3N)

18.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ).



(b) Disconnect the F80 power management control ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

F80-5 (GND2) - Body ground

Always

Below 1 Ω

F80-6 (GND) - Body ground

Always

Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

F80-1 (AM22) - Body ground

Always

11 to 14 V

F80-2 (AM21) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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